an account of the history of a particular word or element of a word.
3.
the study of historical linguistic change, esp. as manifested in individual words.
Origin: 1350–1400; ME < L etymologia < Gk etymología, equiv. to etymológ(os) studying the true meanings and values of words (étymo(s) true (see etymon) + lógos word, reason) + -ia-y3
et·y·mol·o·gy (ět'ə-mŏl'ə-jē) n.
pl.et·y·mol·o·gies
The origin and historical development of a linguistic form as shown by determining its basic elements, earliest known use, and changes in form and meaning, tracing its transmission from one language to another, identifying its cognates in other languages, and reconstructing its ancestral form where possible.
The branch of linguistics that deals with etymologies.
[Middle English etimologie, from Old French ethimologie, from Medieval Latin ethimologia, from Latin etymologia, from Greek etumologiā : etumon, true sense of a word; see etymon + -logiā, -logy.]
1398, from Gk. etymologia, from etymon "true sense" (neut. of etymos "true," related to eteos "true") + logos "word." In classical times, of meanings; later, of histories. Latinized by Cicero as veriloquium.